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 #include &lt;QtDesigner/QExtensionFactory&gt;
 #include &lt;QtDesigner/QExtensionManager&gt;
 #include &lt;QtDesigner/QDesignerFormEditorInterface&gt;
 #include &lt;QtDesigner/QDesignerFormWindowInterface&gt;
 #include &lt;QtDesigner/QDesignerContainerExtension&gt;
 #include &lt;QtDesigner/QDesignerPropertySheetExtension&gt;

 #include &lt;QIcon&gt;
 #include &lt;QtPlugin&gt;

 #include &quot;multipagewidget.h&quot;
 #include &quot;multipagewidgetplugin.h&quot;
 #include &quot;multipagewidgetextensionfactory.h&quot;

 MultiPageWidgetPlugin::MultiPageWidgetPlugin(QObject *parent)
     :QObject(parent)
 {
     initialized = false;
 }

 QString MultiPageWidgetPlugin::name() const
 {
     return QLatin1String(&quot;MultiPageWidget&quot;);
 }

 QString MultiPageWidgetPlugin::group() const
 {
     return QLatin1String(&quot;Display Widgets [Examples]&quot;);
 }

 QString MultiPageWidgetPlugin::toolTip() const
 {
     return QString();
 }

 QString MultiPageWidgetPlugin::whatsThis() const
 {
     return QString();
 }

 QString MultiPageWidgetPlugin::includeFile() const
 {
     return QLatin1String(&quot;multipagewidget.h&quot;);
 }

 QIcon MultiPageWidgetPlugin::icon() const
 {
     return QIcon();
 }

 bool MultiPageWidgetPlugin::isContainer() const
 {
     return true;
 }

 QWidget *MultiPageWidgetPlugin::createWidget(QWidget *parent)
 {
     MultiPageWidget *widget = new MultiPageWidget(parent);
     connect(widget, SIGNAL(currentIndexChanged(int)),
             this, SLOT(currentIndexChanged(int)));
     connect(widget, SIGNAL(pageTitleChanged(const QString &amp;)),
             this, SLOT(pageTitleChanged(const QString &amp;)));
     return widget;
 }

 bool MultiPageWidgetPlugin::isInitialized() const
 {
     return initialized;
 }

 void MultiPageWidgetPlugin::initialize(QDesignerFormEditorInterface *formEditor)
 {
     if (initialized)
         return;

     QExtensionManager *manager = formEditor-&gt;extensionManager();
     QExtensionFactory *factory = new MultiPageWidgetExtensionFactory(manager);

     Q_ASSERT(manager != 0);
     manager-&gt;registerExtensions(factory, Q_TYPEID(QDesignerContainerExtension));

     initialized = true;
 }

 QString MultiPageWidgetPlugin::domXml() const
 {
     return QLatin1String(&quot;\
     &lt;widget class=\&quot;MultiPageWidget\&quot; name=\&quot;multipagewidget\&quot;&gt;\
         &lt;widget class=\&quot;QWidget\&quot; name=\&quot;page\&quot; /&gt;\
     &lt;/widget&gt;\
     &quot;);
 }

 void MultiPageWidgetPlugin::currentIndexChanged(int index)
 {
     Q_UNUSED(index);
     MultiPageWidget *widget = qobject_cast&lt;MultiPageWidget*&gt;(sender());
     if (widget) {
         QDesignerFormWindowInterface *form = QDesignerFormWindowInterface::findFormWindow(widget);
         if (form)
             form-&gt;emitSelectionChanged();
     }
 }

 void MultiPageWidgetPlugin::pageTitleChanged(const QString &amp;title)
 {
     Q_UNUSED(title);
     MultiPageWidget *widget = qobject_cast&lt;MultiPageWidget*&gt;(sender());
     if (widget) {
         QWidget *page = widget-&gt;widget(widget-&gt;currentIndex());
         QDesignerFormWindowInterface *form;
         form = QDesignerFormWindowInterface::findFormWindow(widget);
         if (form) {
             QDesignerFormEditorInterface *editor = form-&gt;core();
             QExtensionManager *manager = editor-&gt;extensionManager();
             QDesignerPropertySheetExtension *sheet;
             sheet = qt_extension&lt;QDesignerPropertySheetExtension*&gt;(manager, page);
             const int propertyIndex = sheet-&gt;indexOf(QLatin1String(&quot;windowTitle&quot;));
             sheet-&gt;setChanged(propertyIndex, true);
         }
     }
 }

 Q_EXPORT_PLUGIN2(containerextension, MultiPageWidgetPlugin)</pre>
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